In the Special:Notifications page designs, the notifications are separated into groups by date, and the user is allowed to mark-as-read a whole group.

In cross-wiki bundles inside the popup, however, we have a similar display by-group -- except this time the groups are the wikis that the notifications originate from. The idea, however, is similar. We do allow the user to mark the whole cross-wiki bundle as read, but not individual wikis.

Should we allow the user to mark individual wikis as read inside the cross-wiki bundle?

If I have a cross-wiki bundle from English Wikipedia, Commons and Hebrew Wikipedia, with 10 items in each, it seems like it would be useful for me to be able to "dismiss" one or two of the wikis and leave as unread the third one.